Pen



FIG. 1 is a front right perspective view of a pen showing my new design;

FIG. 2 is an exploded front right persepctive view of the pen shown in FIG. 1;

FIG. 3 is a front right perspective view of the pen shown in FIG. 1 with the pen cap removed and placed on the opposite end of the pen;

FIG. 4 is a bottom plan view of the pen shown in FIG. 1;

FIG. 5 is a top plan view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a front elevational view thereof;

FIG. 8 is a right side elevational view thereof; and,

FIG. 9 is a rear elevational view thereof.

The stippling shown on part of the pen represents a surface texture. 

The ornamental design for a pen, as shown and described. 